Instructables
A reliable (modified) alarm clock that will wake the dead. I put this together after having several wind-up alarms break on me. It's basically an electronic alarm clock modified to trigger an alarm bell. Since I'm pretty much comatose when I sleep this is just what I needed.
 
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Step 1: Get Materials

Here's what you need to make this:
1.Alarm clock - mine is a cheap one that I got from Walgreens. It gets it's power from the mains and has a 9v battery for backup. I don't remeber how much it cost but it was probably less than $15.


2.Some basic knowledge of electronics and construction techniques. (really?)

Step 2: Get Materials

3.Some sort of doorbell or alarm bell that is loud - The electromagnetic kind work well.(If you use something different then you may have to change wall wart #2) I got mine from eBay. It's like the buzzer type of old doorbell but with a hammer and bell attached.

Step 3: Get Materials

4.(2) Wall wart type power transformers. #1 is 9v DC output (somewhere around 350 ma) and #2 is 9v AC (@500 ma).

Step 4: More Materials

The rest you need is:

5.Relay - 12vdc coil, and able to handle your bell supply power.

6.555 Timer - I think pretty much any standard variation will work.

7.2n3903 Transistor - (this may be superfluous)

8.1 M Ohm Resistor

9.Some hookup wire

10.Extension cord - this is optional, but if you use one make sure its the kind with 3 outlets so you can plug in the clock and two wall warts.

11.hardware and some sort of case to put it all in

Tools

solder, some sort of support (pcb, breadboard, etc.), soldering iron, multimeter (or just a voltmeter), wire stripper, screw drivers, a knife maybe
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Lucidman4 years ago
@sgamer1771, If you want expieriance, just fiddle arounf with old, or broken stuff to see what it does.
thats how i became a pro at fixing things
MCzone Lucidman3 years ago
@sgamer1771, really is this youtube, comment on the persons comment
lane294 years ago
REALY!!!!,       no one comented on this pic at all,     REALY!!!!   ;<]
dark sponge6 years ago
Alarm clock + 1000 watt amplifier + Lots of speakers = Angry friends<br/>
Angry friends = Ex Friends...
Angry friends=You're f***ed.
not really...
He would be, if I was the avenging friend. 220V flowing through aluminium tape under the sheets. Never fails!
Well...that would be kind of a bad idea, as you would need to arrange them in a way...besides, anyone doing that to you would never have been your friend...Anyways, Something having to do with flyback transformers is more fun :D
 Fly back transformers? Please.. its all about the 30 alarm clocks built into the walls (._.)
taylrock5 years ago
make the list[s] in paragraph form

the numbers get confusing >:(
uzerzero7 years ago
I'm a personal fan of some of the Rube Goldberg "wake yourself up" machines, where the alarm goes off and effectively drops a brick/bucket of water/cat etc. on your head. For the most part though, I tend to wake up fairly easily with a generic alarm clock set to buzz, or my cellphone set to 1812 Overture :) vibrating alarms help too. If someone comes in there to wake me up though, I'll be in a bad mood allll day.
GOJIRA! :D That's a way to wake up! :D
Derin uzerzero6 years ago
get a rock band record the 120 decibel increase volume wake up
ha ha you think you could connect an electric airsoft gun so it shoots you when the alarm goes off?
Wire a solenoid to the clock and mount it in the trigger of a .50 cal rifle loaded with blanks! :P
me and my friends have a proposal to make an alarm clock that sack whacks you repetitively until you get up. and another one that has a hydrolic ram under your bed and rams you into the ceiling where there is a big fist....
usaeagle095 years ago
FRESSER WROTE A BOOK DOWN THERE!!! XD but it explains alot
i never use alarm clocks, the noise always gives me a panic atack in the morning. instead, i set the alarm on my cell and put it on vibrate under my pillow. when it goes off it shakes the whole bed XD
*trys method*
*hears something being crushed*

XD!!!

Derin Derin6 years ago
and one time i did this prank to my roommates:i set my alarm to midnight and then *12:59.9*BEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEP!they were pretty pissed off
ReCreate Derin5 years ago
WIN, Thats genius! On my alarm clock you can controll the volume of the buzzing, it can get quite extremley loud :P
Derin ReCreate5 years ago
I actually didn't do it because the roommates included some kid who beat up whoever he was pissed off to
ReCreate5 years ago
All of those images look like a vector, where did you get/make them?
I'm sorry, but why are you using the DC Transformer? you might as well open the alarm clock up, find the wires from the internal transformer, trace them to the PCB. Near them there should be 4 black diodes (4001 or 4004 or something like that). They form a bridge rectifier. from their rectified outputs there should be traces leading to a more or less big cap. Something around 16V 470µF (that's what i found in mine). Now simply hook a 7805 (5V regulator) to the cap. The 7805 gives you a stable 5V that you can use to power the NE555. This saves the cost of a second external transformer. You would also not be wasting so much energy through that 9V DC transformer. The best circuit would be without the 555: find the main IC (there are usually two: one for the clock and the other one is a "tiny radio") and google its datasheet. Many cheap alarm clocks use a chip called ??8560 (first two symbols change between different manufacturers). In the datasheet find the "alarm out" pin. now measure the voltage between this pin and the cap ground when the alarm sounds and when it's off. If the pin goes high when the alarm sounds, simply connect the base of you npn transistor to it (remember the resistor!) and the relay to the C pin of the transistor. If you use a relay up to 12 V you might be able to power it from the clock supply. Don't forget the diode across the relay coil to protect the transistor! This solution saves lots of space, parts (money) and energy, because you don't have to power additional parts. Unfortunately the clocks supply is usually too weak to power the bell, so you'll need that additional AC transformer. Depending on the current required by your bell you might even use the internal power supply, as the bell is not going to ring the whole day ;) (At least i hope you can get out of bed faster)
King Crab5 years ago
Wow, I'm loving these pictures.
how about, instead of attaching it to a bell which wakes up everyone in your house, you tape two wire ends where the bell would go to your finger, so you get shocked.
Coffee bean6 years ago
i simple wire mine up to all computer speakers
Kent7 years ago
There should be a diode across the coil of the relay, to prevent it from zapping the transistor. When current is removed form a coil, it makes a spike of reverse voltage. That is how they make the high (~35,000 V) voltage for the spark plugs in cars from a mere 12V battery. Diodes have a line on one end. Put that end on teh transistor end of the coil, and he other end on the other coil wire. Most bells can run form DC, so just use the same power source as the rest of the circuit. Put a diode on that too, with the line on the plus side.
geeklord Kent6 years ago
could someone make an instructable on that and then I can make big sparks??
sorry to comment on an old post......
Kent geeklord6 years ago
That is the principle of the spark in car engines: The coil in the car is given 12 V, and when it is interrupted, the secondary of the coil produces a huge voltage, like about 35,000V. In a tube TV, the flyback transformer does a similar thing to produce the high voltage. It can be very dangerous.
A safer way to make big sparks is an electrostatic generator. They can make higher voltage, but with less amps, so they are safer. Here is one nice project:
http://www.cavemanchemistry.com/dirod.html
I have made one, and it works great.
Yeah. It could reach back and kill the 555 as well or even the clock itself.
jillg6 years ago
you could get a 80-90 decibel piezo buzzer from radio shack or the dollar store (burglar alarms) and wire it to your alarm clock
Unit0426 years ago
I'm not sure why the 555 is there. Is it simply a buffer between the alarm clock sound output and transistor?
iman8 years ago
try attaching it to a car horn thats what I did there is no way to get back to sleep after that :0
Derin iman6 years ago
whoa
=I MEAN IT
thx u relly achomplish my hard timz
sgamer17716 years ago
what is a good source to start learning about electronics and contruction techniques. I know basic soldering from adding a chip, but that is it right now.
i use Jet Audio on my computer it has a built in alarm with a fade in for the music i want to listen to
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